This flute when played by an elven mage or other wizards of good magic can use it’s melody for many uses.
The song of fire can summon heat
the song of water can flood even the smallest of creeks
the song of wind can create hurricane type winds.
The power of each summon is based on it’s users willpower. You think the power of your summon Ex: play the song of fire but want a small spark then think a small spark. Not for novince wizards, weak minded or dirty minded folk
Teenagers who run away from home to live in the wilderness may become feral. As they become more and more feral, they gain some supernatural powers (a la Peter Pan - ability to fly, things they imagine come true - possibly quite powerful), but at the expense of their humanity and ability to speak, comprehend complex subjects, etc. Maybe they have a leader: the most feral of them all.
A regression into a fantasy childlike state.